First: Lightroom auto detects 32/64bit and installs it\'s self accordingly.
B: The 2.4 \"upgrade\" is really the same file as the full install. You could download and install it, skipping 2.0 completely. Just give it your key when it asks.
3: CS3 will work fine on 64bit Vista. CS4 64bit will just be that much better.
Delta: All 32bit software will run just fine on 64bit Windows. If a 64bit version is available it will usually work a little better. So use 64 if you can, if not don\'t fret.
